Amplifier



FIG. 1 is a perspective view of an amplifier as seen from the front, top and left side;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The dotted line portions of the drawings represent environmental structure only and do not form part of the claimed design. 

The ornamental design for an amplifier, substantially as shown and described. 